Humidifier



FIG. 1 is a perspective view of a humidifier;

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of parts of the drawings is included for the purpose of illustration use and environment and forms no part of the claimed design. 

The ornamental design for a humidifier, as shown and described. 